648561 has 8 divisors (see below), whose sum is σ = 881280. Its totient is φ = 424112.

The previous prime is 648509. The next prime is 648563. The reversal of 648561 is 165846.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 648561 - 2⁷ = 648433 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (648563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1881 + ... + 2198.

It is an arithmetic number, because the mean of its divisors is an integer number (110160).

2⁶⁴⁸⁵⁶¹ is an apocalyptic number.

It is an amenable number.

648561 is a deficient number, since it is larger than the sum of its proper divisors (232719).

648561 is a wasteful number, since it uses less digits than its factorization.

648561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4135.

The product of its digits is 5760, while the sum is 30.

The square root of 648561 is about 805.3328504414. The cubic root of 648561 is about 86.5599392996.

The spelling of 648561 in words is "six hundred forty-eight thousand, five hundred sixty-one".